Literature on evangelism towards professional groups suggest some key aspects of effective evangelism models. However evangelistic methods that would be effective in reaching medical doctors in Thailand have not been well explored or documented. This explanatory sequential mixed methods study aims to identify factors contributing to an

effective evangelism model to reach medical doctors in Thailand by obtaining quantitative results from a survey of 62 Christian medical doctors and following up with seven purposefully selected individuals to explore those results in more depth through qualitative case study analysis. The findings that emerged from this study are that Thai

medical doctors are difficult to assess by non-medically trained Christian. Therefore, Christian medical doctors need to be more conscious in sharing the gospel with their medical colleagues. Evangelical tools that are proven to be effective in the study are:

prayer request, recommending prospects to read the Bible, recommending prospects to watch Christian movies, inviting prospects to church on special occasions, and recommending prospects to read Christian books. In terms of communicating the gospel, the study recommends Christians to be selective in sharing the gospel with those who are willing to listen and doing it appropriately. Christians should consider starting by having an intellectual, logical, and spiritual dialogue, and avoid debating theology reasoning and comparing religions. They should also do so with love and compassion. Churches need to be more deliberate in evangelizing Thai medical doctors and treat them as an unreached group. Training in evangelizing Thai Medical Doctors and setting up support groups for Thai Christian medical doctors are essential, as they are the frontline workers who interact with their unbelieving peers closely and directly.